Staple forming features for circular surgical stapler

ABSTRACT

A surgical instrument includes a stapling assembly and an anvil that releasably couple together to compress and staple tissue. The stapling assembly includes a body having a longitudinal axis, a deck member, and a knife member surrounding the longitudinal axis. The deck member includes a deck surface having an imaginary centerline that surrounds the longitudinal axis, a first deck surface portion extending along a first angular range of the deck surface about the longitudinal axis, and a second deck surface portion extending along a second angular range of the deck surface about the longitudinal axis. A first array of staple openings is disposed on the first deck surface portion and is arranged in a first orientation relative to the deck surface centerline. A second array of staple openings is disposed on the second deck surface portion and is arranged in a second orientation relative to the deck surface centerline.

BACKGROUND

A circular surgical stapler may be used to form an anastomosis betweentwo organ portions of a patient’s digestive tract. Examples of circularsurgical staplers are described in U.S. Pat. No. 5,292,053, entitled“Surgical Anastomosis Stapling Instrument,” issued Mar. 8, 1994; U.S.Pat. No. 5,333,773, entitled “Surgical Anastomosis Stapling Instrument,”issued Aug. 2, 1994; U.S. Pat. No. 5,350,104, entitled “SurgicalAnastomosis Stapling Instrument,” issued Sep. 27, 1994; and U.S. Pat.No. 5,533,661, entitled “Surgical Anastomosis Stapling Instrument,”issued Jul. 9, 1996; and U.S. Pat. No. 8,910,847, entitled “Low CostAnvil Assembly for a Circular Stapler,” issued Dec. 16, 2014. Thedisclosure of each of the above-cited U.S. Pats. is incorporated byreference herein.

Some circular staplers may include a motorized actuation mechanism.Examples of circular staplers with motorized actuation mechanisms aredescribed in U.S. Pub. No. 2015/0083772, entitled “Surgical Stapler withRotary Cam Drive and Return,” published Mar. 26, 2015, now abandoned;U.S. Pat. No. 9,936,949, entitled “Surgical Stapling Instrument withDrive Assembly Having Toggle Features,” issued Apr. 10, 2018; U.S. Pat.No. 9,907,552, entitled “Control Features for Motorized SurgicalStapling Instrument,” issued Mar. 6, 2018; U.S. Pat. No. 9,713,469,entitled “Surgical Stapler with Rotary Cam Drive,” issued Jul. 25, 2017;U.S. Pub. No. 2018/0132849, entitled “Staple Forming PocketConfigurations for Circular Surgical Stapler Anvil,” published May 17,2018; and U.S. Pat. No. 10,709,452, entitled “Methods and Systems forPerforming Circular Stapling,” issued Jul. 14, 2020. The disclosure ofeach of the above-cited U.S. Pat. Publications and U.S. Pats. isincorporated by reference herein.

While various kinds of surgical stapling instruments and associatedcomponents have been made and used, it is believed that no one prior tothe inventor(s) has made or used the invention described in the appendedclaims.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute apart of this specification, illustrate embodiments of the invention,and, together with the general description of the invention given above,and the detailed description of the embodiments given below, serve toexplain the principles of the present invention.

FIG. 1 depicts a perspective view of an exemplary circular surgicalstapler that includes a handle assembly, a shaft assembly, and an endeffector having a stapling head assembly and an anvil;

FIG. 2 depicts a perspective view of the circular stapler of FIG. 1 ,with a battery pack removed from the handle assembly and the anvilseparated from the stapling head assembly;

FIG. 3 depicts a perspective view of the anvil of the circular staplerof FIG. 1 ;

FIG. 4 depicts a perspective view of the stapling head assembly of thecircular stapler of FIG. 1 ;

FIG. 5 depicts an exploded perspective view of the stapling headassembly of FIG. 4 ;

FIG. 6 depicts an exploded perspective view of the circular stapler ofFIG. 1 , with portions of the shaft assembly shown separated from eachother;

FIG. 7A depicts a cross-sectional side view of the anvil of FIG. 3positioned within a first section of a digestive tract and the staplinghead assembly of FIG. 4 positioned within a separate second section ofthe digestive tract, with the anvil separated from the stapling headassembly;

FIG. 7B depicts a cross-sectional side view of the anvil of FIG. 3positioned within the first section of the digestive tract and thestapling head assembly of FIG. 4 positioned within the separate secondsection of the digestive tract, with the anvil secured to the staplinghead assembly;

FIG. 7C depicts a cross-sectional side view of the anvil of FIG. 3positioned within the first section of the digestive tract and thestapling head assembly of FIG. 4 positioned within the separate secondsection of the digestive tract, with the anvil retracted toward thestapling head assembly to thereby clamp tissue between the anvil and thestapling head assembly;

FIG. 7D depicts a cross-sectional side view of the anvil of FIG. 3positioned within the first section of the digestive tract and thestapling head assembly of FIG. 4 positioned within the second section ofthe digestive tract, with the stapling head assembly actuated to severand staple the clamped tissue and thereby joining the first and secondsections of the digestive tract;

FIG. 7E depicts a cross-sectional side view of the first and secondsections of the digestive tract of FIG. 7A joined together at anend-to-end anastomosis formed with the circular stapler of FIG. 1 ;

FIG. 8 depicts a schematic perspective view of a distal portion of anexemplary stapling head assembly configured for use with surgicalstapler of FIG. 1 ;

FIG. 9 depicts a top plan view of a deck surface of the stapling headassembly of FIG. 8 ;

FIG. 10 depicts a top plan view of a second exemplary deck surfaceconfigured for use with the stapling head assembly of FIG. 8 ;

FIG. 11 depicts a schematic perspective view of another exemplary endeffector including a stapling head assembly and an anvil configured foruse with the surgical stapler of FIG. 1 ;

FIG. 12 depicts a top plan view of a deck surface of the stapling headassembly of FIG. 11 ;

FIG. 13 depicts a top plan view of another exemplary stapling headassembly;

FIG. 14 depicts a side elevational view of the stapling head assembliesof FIGS. 11 and 13 , including a stepped deck surface;

FIG. 15 depicts a side elevational view of another exemplary staplinghead assembly including a stepped deck surface;

FIG. 16 depicts a schematic perspective view of another exemplarystapling head assembly including an angled elliptical deck surface; and

FIG. 17 depicts a top plan view of the elliptical deck surface of thestapling head assembly of FIG. 16 .

The drawings are not intended to be limiting in any way, and it iscontemplated that various embodiments of the technology may be carriedout in a variety of other ways, including those not necessarily depictedin the drawings. The accompanying drawings incorporated in and forming apart of the specification illustrate several aspects of the presenttechnology, and together with the description serve to explain theprinciples of the technology; it being understood, however, that thistechnology is not limited to the precise arrangements shown.

DETAILED DESCRIPTION

The following description of certain examples of the technology shouldnot be used to limit its scope. Other examples, features, aspects,embodiments, and advantages of the technology will become apparent tothose skilled in the art from the following description, which is by wayof illustration, one of the best modes contemplated for carrying out thetechnology. As will be realized, the technology described herein iscapable of other different and obvious aspects, all without departingfrom the technology. Accordingly, the drawings and descriptions shouldbe regarded as illustrative in nature and not restrictive.

For clarity of disclosure, the terms “proximal” and “distal” are definedherein relative to a surgeon, or other operator, grasping a surgicalinstrument having a distal surgical end effector. The term “proximal”refers to the position of an element arranged closer to the surgeon, andthe term “distal” refers to the position of an element arranged closerto the surgical end effector of the surgical instrument and further awayfrom the surgeon. Moreover, to the extent that spatial terms such as“top,” “bottom,” “upper,” “lower,” “vertical,” “horizontal,” or the likeare used herein with reference to the drawings, it will be appreciatedthat such terms are used for exemplary description purposes only and arenot intended to be limiting or absolute. In that regard, it will beunderstood that surgical instruments such as those disclosed herein maybe used in a variety of orientations and positions not limited to thoseshown and described herein.

Furthermore, the terms “about,” “approximately,” and the like as usedherein in connection with any numerical values or ranges of values areintended to encompass the exact value(s) referenced as well as asuitable tolerance that enables the referenced feature or combination offeatures to function for the intended purpose described herein.

I. Overview of Exemplary Circular Surgical Stapling Instrument

FIGS. 1-2 depict an exemplary circular surgical stapling instrument (10)that may be used to provide an end-to-end, side-to-side, or end-to-sideanastomosis between two sections of an anatomical lumen such as aportion of a patient’s digestive tract. Instrument (10) of this exampleincludes a body assembly in the form of a handle assembly (100), a shaftassembly (200) extending distally from handle assembly (100), a staplinghead assembly (300) at a distal end of shaft assembly (200), and ananvil (400) configured to releasably couple and cooperate with staplinghead assembly (300) to clamp, staple, and cut tissue. Instrument (10)further includes a removable battery pack (120) operable to provideelectrical power to a motor (160) housed within handle assembly (100),as will be described in greater detail below.

As shown in FIGS. 1-2 and as will be described in greater detail below,anvil (400) is configured to removably couple with shaft assembly (200),adjacent to stapling head assembly (300). As will also be described ingreater detail below, anvil (400) and stapling head assembly (300) areconfigured to cooperate to manipulate tissue in three ways, includingclamping the tissue, cutting the tissue, and stapling the tissue. Arotatable knob (130) at the proximal end of handle assembly (100) isrotatable to provide precise clamping of the tissue between anvil (400)and stapling head assembly (300). When a safety trigger (140) of handleassembly (100) is pivoted away from a firing trigger (150) of handleassembly (100), firing trigger (150) may be actuated to thereby providecutting and stapling of the clamped tissue.

A. Exemplary Anvil

As best seen in FIG. 3 , anvil (400) of the present example comprises ahead (410) and a shank (420). Head (410) includes a proximal staplingsurface (412) that defines a plurality of staple forming pockets (414).Staple forming pockets (414) are arranged in two concentric annulararrays in the present example. Staple forming pockets (414) areconfigured to deform staples as the staples are driven into stapleforming pockets (414). Proximal stapling surface (412) terminates at aninner edge (416), which defines an outer boundary of an annular recess(418) surrounding shank (420). A breakable washer (417) is positionedwithin annular recess (418) and is configured to provide the operatorwith a tactile and audible indication that a distal firing stroke hasbeen completed, in addition to serving as a cutting board, as describedin greater detail below.

Shank (420) defines a bore (422) and includes a pair of pivoting latchmembers (430). Latch members (430) are positioned within bore (422) suchthat distal ends (434) are positioned at the proximal ends of lateralopenings (424), which are formed through the sidewall of shank (420).Latch members (430) thus act as retaining clips. This allows anvil (400)to be removably secured to an actuatable closure member in the form of atrocar (330) of stapling head assembly (300), as will be described ingreater detail below. Shank (420) of anvil (400) and trocar (330) ofstapling head assembly (300) thus cooperate with one another as couplingmembers.

B. Exemplary Stapling Head Assembly

As best seen in FIGS. 4 and 5 , stapling head assembly (300) of thepresent example is coupled to a distal end of shaft assembly (200) andcomprises a tubular body member (310) and a staple driver member (350)slidably housed therein. Body member (310) includes a distally extendingcylindraceous inner core member (312) positioned coaxially therein. Bodymember (310) is fixedly secured to an outer sheath (210) of shaftassembly (200), and body member (310) and outer sheath (210) thus servetogether as a mechanical ground for stapling head assembly (300).

Trocar (330) is positioned coaxially within inner core member (312) ofbody member (310). As will be described in greater detail below, trocar(330) is operable to translate distally and proximally relative to bodymember (310) in response to rotation of knob (130) relative to casing(110) of handle assembly (100). Trocar (330) comprises a shaft (332) anda head (334). Head (334) includes a pointed tip (336) and a radiallyinwardly extending proximal surface (338). Head (334) and the distalportion of shaft (332) are configured for insertion into bore (422) ofanvil (400). Proximal surface (338) and latch shelves (436) havecomplementary positions and configurations such that latch shelves (436)engage proximal surface (338) when shank (420) of anvil (400) is fullyseated on trocar (330). Anvil (400) is thus secured to trocar (330)through a snap fit provided by latch members (430).

Staple driver member (350) is operable to actuate longitudinally withinbody member (310) in response to activation of motor (160) as will bedescribed in greater detail below. As shown best in FIG. 5 , stapledriver member (350) of the present example includes two distallypresented concentric annular arrays of staple drivers (352). Stapledrivers (352) are arranged to correspond with the arrangement of stapleforming pockets (414) of anvil (400). Thus, each staple driver (352) isconfigured to drive a corresponding staple distally into a correspondingstaple forming pocket (414) when stapling head assembly (300) isactuated (or “fired”). Staple driver member (350) also defines a bore(354) that is configured to coaxially and slidably receive core member(312) of body member (310). An annular array of studs (356) projectdistally from a distally presented surface surrounding bore (354).

A cylindraceous knife member (340) is coaxially positioned within adistally-opening central recess of staple driver member (350) thatcommunicates with bore (354). Knife member (340) includes a distallypresented, sharp circular cutting edge (342). Knife member (340) issized such that knife member (340) defines an outer diameter that isjust smaller than the diameter defined by the radially inner-mostsurfaces of the inner annular array of staple drivers (352). Knifemember (340) also defines a central opening that is configured tocoaxially receive core member (312) of body member (310). An annulararray of openings (346) formed in knife member (340) is configured tomate with the annular array of studs (356) of staple driver member(350), such that knife member (340) is fixedly secured to staple drivermember (350) via studs (356) and openings (346).

An annular deck member (320) is fixedly secured to a distal end of bodymember (310). Deck member (320) includes a distally presented staplingsurface in the form of a deck surface (322) having two concentricannular arrays of staple openings (324). Staple openings (324) arearranged to align with the arrangement of staple drivers (352) of stapledriver member (350) and staple forming pockets (414) of anvil (400)described above. Each staple opening (324) is configured to slidablyreceive and provide a pathway for a corresponding staple driver (352) todrive a corresponding staple distally through deck member (320) and intoa corresponding staple forming pocket (414) when stapling head assembly(300) is actuated. As best seen in FIG. 4 , deck member (320) has acentral opening that defines an inner diameter that is just slightlylarger than the outer diameter defined by knife member (340). Deckmember (320) is thus configured to permit knife member (340) totranslate longitudinally through the central opening concurrently withlongitudinal translation of staple driver member (350). In particular,knife member (340) is configured to actuate relative to deck member(340) between a proximal retracted position and a distal extendedposition, where cutting edge (342) is proximal to deck surface (322) inthe proximal retracted position and distal to deck surface (322) in thedistal extended position.

C. Exemplary Shaft Assembly

FIG. 6 shows various components of shaft assembly (200), whichoperatively couple components of stapling head assembly (300) withcomponents of handle assembly (100). In particular, and as noted above,shaft assembly (200) includes an outer sheath (210) that extends betweenhandle assembly (100) and body member (310) and includes a medialportion that extends along a curved path.

Shaft assembly (200) further includes a trocar actuation rod (220)having a proximal end operatively coupled with rotatable knob (130) anda distal end coupled with a flexible trocar actuation band assembly(230), the assembly of which is slidably housed within outer sheath(210). The distal end of trocar actuation band assembly (230) is fixedlysecured to the proximal end of trocar shaft (332), such that trocar(330) will translate longitudinally relative to outer sheath (210) inresponse to translation of trocar actuation band assembly (230) andtrocar actuation rod (220) relative to outer sheath (210), which occursin response to rotation of rotatable knob (130). A clip (222) is fixedlysecured to trocar actuation rod (220) and is configured to cooperatewith complementary features within handle assembly (100) to preventtrocar actuation rod (220) from rotating within handle assembly (100)while still permitting trocar actuation rod (220) to translatelongitudinally within handle assembly (100). Trocar actuation rod (220)further includes a section of coarse helical threading (224) and asection of fine helical threading (226) proximal to coarse helicalthreading (224), which are configured to control a rate of longitudinaladvancement of trocar actuation rod (220), as described in greaterdetail below.

Shaft assembly (200) further includes a stapling head assembly driver(240) that is slidably housed within outer sheath (210) and about thecombination of trocar actuation rod (220) and trocar actuation bandassembly (230). Stapling head assembly driver (240) includes a distalend that is fixedly secured to the proximal end of staple driver member(350), a proximal end secured to a drive bracket (250) via a pin (242),and a flexible section disposed therebetween. It should therefore beunderstood that staple driver member (350) will translate longitudinallyrelative to outer sheath (210) in response to translation of staplinghead assembly driver (240) and drive bracket (250) relative to outersheath (210).

D. Exemplary Handle Assembly and User Input Features

As shown in FIG. 1 , handle assembly (100) includes a casing (110)having a lower portion that defines an obliquely oriented pistol grip(112) and an upper portion that supports a user interface feature (114)and releasably receives a battery pack (120), as described in greaterdetail below. Handle assembly (100) further includes several featuresthat are operable to actuate anvil (400) and stapling head assembly(300). In particular, handle assembly (100) includes a rotatable knob(130), a safety trigger (140), a firing trigger (150), a motor (160),and a motor activation module (180). Knob (130) is coupled with trocaractuation rod (220) via a nut (not shown), such that coarse helicalthreading (224) will selectively engage a thread engagement featurewithin the interior of the nut; and such that fine helical threading(226) will selectively engage a thread engagement feature within theinterior of knob (130). These complementary structures are configuredsuch that trocar actuation rod (220) will first translate proximally ata relatively slow rate, and then translate proximally at a relativelyfast rate, in response to rotation of knob (130).

It should be understood that when anvil (400) is coupled with trocar(330), rotation of knob (130) will provide corresponding translation ofanvil (400) relative to stapling head assembly (300). It should also beunderstood that knob (130) may be rotated in a first angular direction(e.g., clockwise) to retract anvil (400) proximally toward stapling headassembly (300); and in a second angular direction (e.g.,counterclockwise) to extend anvil (400) distally away from stapling headassembly (300). Knob (130) may thus be used to adjust a gap distance (d)between opposing stapling surfaces (412, 322) of anvil (400) andstapling head assembly (300) until a suitable gap distance (d) has beenachieved, for example as shown in FIG. 7C described below.

Firing trigger (150) is operable to activate motor (160) to therebyactuate stapling head assembly (300) to staple and cut tissue clampedbetween anvil (400) and stapling head assembly (300). Safety trigger(140) is operable to selectively block actuation of firing trigger (150)based on the longitudinal position of anvil (400) in relation tostapling head assembly (300). Handle assembly (100) also includescomponents that are operable to selectively lock out both triggers (140,150) based on the position of anvil (400) relative to stapling headassembly (300). For instance, safety trigger (140) may be blocked fromrotating from an engaged position to a disengaged position until theposition of anvil (400) relative to stapling head assembly (300) iswithin a predefined range. Accordingly, until the anvil position iswithin the predefined range, actuation of firing trigger (150) isblocked by safety trigger (140), thereby inhibiting firing of staplinghead assembly (300).

Firing trigger (150) is operable to actuate a switch of motor activationmodule (180) (FIG. 1 ) when firing trigger (150) is pivoted proximallyto a fired position. Motor activation module (180) is in communicationwith battery pack (120) and motor (160), such that motor activationmodule (180) is configured to provide activation of motor (160) withelectrical power from battery pack (120) in response to firing trigger(150) actuating the switch of motor activation module (180). Thus, motor(160) will be activated when firing trigger (150) is pivoted. Thisactivation of motor (160) will actuate stapling head assembly (300) viadrive bracket (250), as described in greater detail below.

E. Exemplary Anastomosis Procedure With Circular Stapling Instrument

FIGS. 7A-7E show instrument (10) being used to form an anastomosis (70)between two tubular anatomical structures (20, 40). By way of exampleonly, the tubular anatomical structures (20, 40) may comprise sectionsof a patient’s esophagus, colon, or other portions of the patient’sdigestive tract, or any other tubular anatomical structures.

As shown in FIG. 7A, anvil (400) is positioned in one tubular anatomicalstructure (20) and stapling head assembly (300) is positioned in anothertubular anatomical structure (40). As shown in FIG. 7A, anvil (400) ispositioned in tubular anatomical structure (20) such that shank (420)protrudes from the open severed end (22) of tubular anatomical structure(20). In the present example, purse-string suture (30) is provided abouta mid-region of shank (420) to generally secure the position of anvil(400) in tubular anatomical structure (20). Stapling head assembly (300)is positioned in tubular anatomical structure (40) such that trocar(330) protrudes from the open severed end (42) of tubular anatomicalstructure (20). A purse-string suture (50) is provided about amid-region of shaft (332) to generally secure the position of staplinghead assembly (300) in tubular anatomical structure (40). Stapling headassembly (300) is then urged distally to ensure that stapling headassembly (300) is fully seated at the distal end of tubular anatomicalstructure (40).

Next, anvil (400) is secured to trocar (330) by inserting trocar (330)into bore (422) as shown in FIG. 7B. Latch members (430) of anvil (400)engage head (334) of trocar (330), thereby providing a secure fitbetween anvil (400) and trocar (330). The operator then rotates knob(130) while holding casing (110) stationary via pistol grip (112). Thisrotation of knob (130) causes trocar (330) and anvil (400) to retractproximally. As shown in FIG. 7C, this proximal retraction of trocar(330) and anvil (400) compresses the tissue of tubular anatomicalstructures (20, 40) between surfaces (412, 322) of anvil (400) andstapling head assembly (300). As this occurs, the operator may observethe tactile resistance or feedback via knob (130) while turning knob(130), with such tactile resistance or feedback indicating that thetissue is being compressed. As the tissue is being compressed, theoperator may visually observe the position of an indicator needle (notshown) within user interface feature (114) of handle assembly (100) todetermine whether the gap distance (d) between opposing surfaces (412,322) of anvil (400) and stapling head assembly (300) is appropriate; andmake any necessary adjustments via knob (130).

Once the operator has appropriately set the gap distance (d) via knob(130), the operator pivots safety trigger (140) toward pistol grip (112)to enable actuation of firing trigger (150). The operator then pivotsfiring trigger (150) toward pistol grip (112), thus causing firingtrigger (150) to actuate the switch of motor activation module (180) andthereby activate motor (160) to rotate. This rotation of motor (160)causes actuation (or “firing”) of stapling head assembly (300) byactuating drive bracket (250) distally to thereby drive knife member(340) and staple driver member (350) distally together, as shown in FIG.7D.

As knife member (340) translates distally, cutting edge (342) of knifemember (340) cuts excess tissue that is positioned within annular recess(418) of anvil (400) and the interior of knife member (340).Additionally, washer (417) positioned within annular recess (418) ofanvil (400) is broken by knife member (340) when the knife member (340)completes a full distal range of motion from the position shown in FIG.7C to the position shown in FIG. 7D. It should be understood that washer(417) may also serve as a cutting board for knife member (340) to assistin cutting of tissue.

As staple driver member (350) translates distally from the positionshown in FIG. 7C to the position shown in FIG. 7D, staple driver member(350) drives staples (90) through the tissue of tubular anatomicalstructures (20, 40) and into staple forming pockets (414) of anvil(400). Staple forming pockets (414) deform the driven staples (90) intoa “B” shape or a three-dimensional shape, for example, such that theformed staples (90) secure the ends of tissue together, thereby couplingtubular anatomical structure (20) with tubular anatomical structure(40).

After the operator has actuated (or “fired”) stapling head assembly(300) as shown in FIG. 7D, the operator rotates knob (130) to driveanvil (400) distally away from stapling head assembly (300), therebyincreasing the gap distance (d) to facilitate release of the tissuebetween surfaces (412, 322). The operator then removes instrument (10)from the patient, with anvil (400) still secured to trocar (330). Withinstrument (10) removed, the tubular anatomical structures (20, 40) areleft secured together by two annular arrays of staples (90) at ananastomosis (70) as shown in FIG. 7E. The inner diameter of theanastomosis (70) is defined by the severed edge (60) left by knifemember (340).

II. Exemplary End Effector Having Staple Forming Features Arranged inMultiple Orientations

As noted above, the inner diameter of anastomosis (70) formed byinstrument (10) is defined by the outer diameter of knife member (340).Because knife member (240) is smaller than the inner diameters oftubular anatomical structures (20, 40), the resulting diameter ofanastomosis (70) is generally smaller than that of each tubularanatomical structure (20, 40). Additionally, the configuration of formedstaples (90) may inhibit the ability of anastomosis (70) to expandradially.

In some procedures, it may be desirable to form an anastomosis (70) ofenlarged diameter and/or to enable the annular arrays of formed staples(90) to expand radially, thereby minimizing strictures, enabling betterperistalsis, and minimizing local tension in and resulting damage to thejoined portions of tubular anatomical structures (20, 40). Accordingly,in some such instances, it may be desirable to configure stapling headassembly (300) and anvil (400) with features that enable formation ofsuch an anastomosis and/or patterns of formed staples (90). Exemplaryversions of such features are described in greater detail below.

A. Stapling Head Assembly With Alternating Arrays of Staple FormingFeatures

FIG. 8 schematically shows another exemplary stapling head assembly(500) that is configured for use with surgical instrument (10) in placeof stapling head assembly (300) described above. Stapling head assembly(500) is similar in structure and function to stapling head assembly(300) except as otherwise described below. In particular, stapling headassembly (500) includes a plurality of arrays (510, 520) of stapleopenings (560) oriented in different manners such that stapling headassembly (500) is configured to create an anastomosis between tubularanatomical structures (20, 40) of a patient with an annular array offormed staples that is capable of expanding radially outwardly with thestapled tissue. It will be appreciated that stapling head assembly (500)may be used in combination with an anvil (not shown) having similarlyarranged arrays of staple forming pockets configured to align with thestaple openings of stapling head assembly (500).

Stapling head assembly (500) includes a body member (502) and a deckmember (504) disposed at a distal end of body member (502) and having adistally facing surface in the form of a deck surface (530) thatsurrounds a central longitudinal axis of stapling head assembly (500).Stapling head assembly (500) is shown with portions of the stapling headassembly (500) omitted to show details of the deck surface (530). Decksurface (530) includes an interior perimeter (534), an exteriorperimeter (536), and an imaginary centerline (not shown) that ispositioned equidistantly between interior perimeter (534) and exteriorperimeter (536) and surrounds the central longitudinal axis. Bothinterior and exterior perimeters (534, 536) are circular in the presentexample. Interior perimeter (534) defines a lumen (532) that extendsproximally through the deck member (504). Though not shown, staplinghead assembly (500) may further include a longitudinal actuatablecircular knife member and an anvil coupling member in the form of atrocar disposed within lumen (532).

As shown in FIGS. 8 and 9 , deck surface (530) further includes aplurality of staple openings (560) that are arranged in a first array(510) and second array (520) about the deck surface (530) in analternating pattern on circumferentially adjacent deck surface portions,each of which extends along a respective angular range of deck surface(530) about the central longitudinal axis. More specifically, first andsecond arrays (510, 520) of staple openings (560) are arranged in analternating manner in quadrants (I, II, III, IV), where each quadrant(I, II, III, IV) extends successively along a respective 90 degreeangular range of deck surface (530) about the central longitudinal axis.First and third quadrants (I, III) are diametrically opposed from oneanother about the central longitudinal axis, and second and fourthquadrants (II, IV) are diametrically opposed from one another about thecentral longitudinal axis. In the present example, first quadrant (I)includes a first iteration (512) (also referred to herein as a“section”) of first array (510) of staple openings (560); secondquadrant (II) includes a first iteration (522) of second array (520) ofstaple openings (560); third quadrant (III) includes a second iteration(514) of first array (510) of staple openings (560); and fourth quadrant(IV) includes a second iteration (524) of second array (520) of stapleopenings (560). In other words, each quadrant (I, II, III, IV) of decksurface (530) includes a respective array (512, 514, 522, 524) of stapleopenings (560), where arrays (512, 514) of the first and third quadrants(I, III) have the same first orientation relative to the imaginarycenterline of deck surface (530), and where arrays (522, 524) of thesecond and the fourth quadrants (II, IV) have the same secondorientation relative to the imaginary centerline of deck surface (530),where the first and second orientations are different.

FIG. 9 shows deck surface (530) with a first quadrant (I) at the 12o’clock position, second quadrant (II) in the 3 o’clock position, athird quadrant (III) in the 6 o’clock position, and a fourth quadrant(IV) in the 9 o’clock position. As described above, first array (510) ofstaple openings (560) includes first and third sections (512, 514),where first section (512) is located in first quadrant (I) of decksurface (530) and third section (514) is located in third quadrant (III)diametrically opposed from first quadrant (I). Second array (520) ofstaple openings (560) includes second and fourth sections (522, 524),where second section (522) is located in second quadrant (II) of decksurface (530) and fourth section (524) is located in fourth quadrant(IV) of deck surface (530) diametrically opposed from second quadrant(II).

As shown in FIG. 8 , in the present version each staple opening (560) offirst array (510) has an elongate oval shape having a first width (516)that is generally equal to a second width (526) of staple openings (560)of second array (520). Staple openings (560) of first array (510) have afirst length (518) that is longer than, and more specificallyapproximately twice as long as, a second length (528) of second stapleopenings (560) of second array (510).

As shown in FIG. 9 , each section (512, 514) of first array (510) ofstaple openings (560) includes a first inner row (538) and a first outerrow (540). First inner row (538) lies along an inner imaginary circle(IIC) and first outer row (540) lies along an outer imaginary circle(OIC) arranged concentrically about inner imaginary circle (IIC) and thecentral longitudinal axis of stapling head assembly (500). Each stapleopening (560) of sections (512, 514) of first array (510) is arrangedsuch that a length of the staple opening (560) is tangential to inner orouter imaginary circle (IIC, OIC), respectively, and thus tangentialrelative to the imaginary centerline of deck surface (530).Additionally, staple openings (560) in first inner row (538) arecircumferentially offset from staple openings (560) in first outer row(540) so that staple openings (560) in first inner row (538) align withgaps (548) between adjacent staples openings (560) of the first outerrow (540) to ensure effective sealing of the stapled tissue.

Each section (522, 524) of second array (520) of staple openings (560)includes a second inner row (542), a second middle row (544), and asecond outer row (546). Second inner row (542) is positioned along innerimaginary circle (IIC). Second outer row (544) is positioned along outerimaginary circle (OIC). Second middle row (546) is positioned betweeninner imaginary circle (IIC) and outer imaginary circle (OIC), along theimaginary centerline of deck surface (530).

Each staple opening (560) of second inner row (542) is non-tangentiallyand angularly oriented relative to inner imaginary circle (IIC), andthus to the imaginary deck surface centerline, in a first angularorientation in which a first end (572) is spaced closer to the centrallongitudinal axis than an opposed second end (574). Similarly, eachstaple opening (560) of second outer row (546) of second array (520) isnon-tangentially and angularly oriented relative to the outer imaginarycircle (OIC), and thus to the imaginary deck surface centerline, in thesame angular orientation. In the present version, each staple opening(560) in second inner and outer rows (542, 546) is oriented such thatits length is angled at approximately 45 degrees relative to therespective inner and outer imaginary circles (IIC, OIC).

In contrast to staple openings (560) of second inner and outer rows(542, 546) of second array (520), each staple opening (560) of secondmiddle row (546) of second array (520) is non-tangentially and angularlyoriented relative to inner and outer imaginary circles (IIC, OIC), andthus to the imaginary deck surface centerline, in an opposite angularorientation in which first end (572) of each staple opening (560) isfarther from the central longitudinal axis than its second ends (574).In the present version, each of staple opening (560) of the secondmiddle row (574) is angled at approximately 40 degrees relative to theimaginary circles (IIC, OIC) and the deck surface centerline.Accordingly, in the present example, staple openings (560) of secondarray (520) are arranged in a herringbone pattern and thus areconfigured to apply a herringbone shaped staple pattern of staples totissue. The non-tangential, angular orientation of staple openings(560), and thus the corresponding staples (90) deployed into tissuethrough openings (560), creates an anastomosis (70) in tissue structures(20, 40) about which the formed staples (90) in the stapled regionscorresponding to second array (520) are configured to pivot relative toone another about the formed staple legs in the plane of the anastomosis(70). Consequently, the diametrically opposed circumferential portionsof the applied staple pattern corresponding to second array (520) areconfigured to expand radially outwardly with stapled tissue structures(20, 40) during natural radial expansion of tissue structures (20, 40)at anastomosis (70), for example during peristalsis. In some instances,the circumferential portions of tissue structures (20,40) stapled bysecond array (520) of staple openings (560) may be capable of expandingradially outwardly approximately 125 percent to 200 percent more thanthe circumferential portions of tissue structures (20, 40) stapled byfirst array (510) of staple openings (560).

FIG. 10 shows an exemplary alternative deck surface (630) constructedand operable similar to deck surface (530) described above, except asotherwise described below. Deck surface (630) includes a first array(610) of staple openings (660), each of which is shorter in length thanstaple openings (560) of first array (510) and similar in length tostaple openings (560) in second array (520). As a result, the firstarray (610) of staple openings (660) includes more staple openings (660)than first array (510) such that stapling head assembly (500) need beloaded with only one size of staples.

B. Second Exemplary End Effector With Alternating Arrays of StapleForming Features and Stepped Deck Surface

In some instances, it may be desirable to substitute a non-circular endeffector for use with surgical instrument (10) to facilitate positioningof the end effector within the patient and to form an anastomosis (70)having an enlarged maximum diameter that more effectively facilitatesperistalsis within the staple tissue structures (20, 40) at the site ofthe anastomosis (70). FIG. 11 shows an exemplary end effector (700)having such abilities. End effector (700) includes a stapling headassembly (720) and an anvil (750) configured to releasably couple withstapling head assembly (720) to compress, staple, and cut tissue.Stapling head assembly (720) is similar to stapling head assembly (500)described above except as otherwise described below. Stapling headassembly (720) includes a body member (722) and a deck member (724)having a stepped deck surface (730), and anvil (550) includes a shank(756) and a head (754) having a stepped proximal surface (758)configured to cooperate with stepped deck surface (730) to create ananastomosis (70) of enlarged diameter and having the ability to expandand contract radially with the stapled tissue structures.

FIG. 11 schematically shows non-circular end effector (700) withportions of non-circular stapling head assembly (720) and non-circularanvil (750) omitted to show details of stepped deck member (724) havingvarious arrays of staple openings (760). Non-circular stapling headassembly (720) and non-circular anvil (750) are constructed and operablesimilar to stapling head assembly (300) and anvil (400) described above,except as otherwise described below.

Non-circular anvil (750) is similar to anvil (400) described above.Non-circular anvil (750) includes a head (754) and shank (756). Shank(756) extends proximally from head (754) and is configured to releasablycouple with a coupling feature (not shown), such as an actuatabletrocar, of stapling head assembly (720). Head (754) has a non-circularshape that matches the non-circular shape of an exterior profile of thestapling head assembly (720). Proximal surface (758) has a plurality ofstaple forming pockets (not shown) similar to staple forming pockets(414) described above and configured to align with staple openings (760)of deck member (724). Proximal surface (758) is configured to cooperatewith deck surface (730) to clamp and staple tissue.

As shown in FIGS. 11-12 ,body member (722) extends distally along acentral longitudinal axis (LA) of stapling head assembly (720) fromdistal end of shaft assembly (200). Though not shown, stapling headassembly (720) may further include a knife member and a staple drivermember slidably housed within body member (722) similar to knife (340)and staple driver member (350) of stapling head assembly (300).

Deck member (724) includes a distally presented stapling surface in theform of a deck surface (730). Deck surface (730) has a non-circularconfiguration with an exterior perimeter (736) defining a firstnon-circular shape and an interior perimeter (734) defining a secondnon-circular shape that is different than the first non-circular shape.In the present example, exterior perimeter (736) has an oval shape, andthe interior perimeter has a “dogbone” shape that defines a lumen (732)within body member (722).

Deck surface (730) includes a first deck portion (738), a second deckportion (740), and a third deck portion (742), which collectively definean imaginary deck surface centerline (not shown) that surrounds centrallongitudinal axis (LA) and is spaced equidistantly between interiorperimeter (734) and exterior perimeter (736). First deck portion (738)defines and wholly lies in a first deck plane (1DP) that is orthogonalto the central longitudinal axis (LA). Second deck portion (740) definesand wholly lies in a second deck plane (2DP) that is orthogonal to thecentral longitudinal axis (LA). Second deck plane (2DP) is distallypositioned relative to the first deck plane (1DP) and is parallel to thefirst deck plane (1DP). In other versions, for example as shown in FIG.15 , first deck portion (738) and/or second deck portion (740) maydefine a corresponding deck plane that is obliquely angled relative tothe central longitudinal axis (LA). Third deck portion (742) defines andwholly lies in a third deck plane (3DP) that is obliquely angledrelative to the central longitudinal axis (LA) and the first and seconddeck planes (1DP, 2DP). Third deck portion (742) includes a chamferedinterior corner (744) on both ends that transition into the first andsecond deck portions (738,740), thus providing deck surface (730) with adog bone shape. In other versions, the interior corner may be rounded.

First deck portion (738) is positioned at a first longitudinal end ofthird deck portion (742) in a direction transverse to centrallongitudinal axis (LA). First deck portion (738) has an arcuate,semi-circular shape in first deck plane (1DP) and has a first array(746) of staple openings (760). Each staple opening (760) of first array(746) is tangent to a corresponding semi-circular arcuate portion of thedeck surface centerline that extends about a first end axis (1EA), andfirst array (746) has a first inner row (762) and a first outer row(764). Each staple opening (760) of first outer row (764) iscircumferentially indexed around the first end axis (1EA) by a distancethat approximately equals half of the length of staple opening (760) inthe first inner row (762) so that staple openings (760) of the firstinner and outer rows (762,764) overlap in a staple opening gap (766)between adjacent staple openings (760), thus ensure proper sealing ofthe stapled tissue. It will be appreciated that staple openings (760) oneach of deck portions (738, 740, 742) are suitable arranged in such amanner to ensure proper sealing of tissue.

Second deck portion (740) is positioned at an opposite secondlongitudinal end of the third deck portion (742) in a directiontransverse to central longitudinal axis (LA). Similar to first deckportion (738), second deck portion (740) has an arcuate, semi-circularshape in second deck plane (2DP) and has a second array (748) of stapleopenings (760). Each staple opening (760) of second array (748) istangent to a corresponding semi-circular arcuate portion of the decksurface centerline that extends about a second end axis (2EA), andsecond array (748) has a second inner row (768) and a second outer row(770).

Third deck portion (742) is positioned between the first and second deckportions (738, 740) along third deck plane (3DP) and has a linear shape.Third deck portion (742) has a first side (780) located on a first sideof the central longitudinal axis (LA) and a second side (782) located onan opposed second side of central longitudinal axis (LA), such that eachside (780, 782) is circumferentially adjacent to and interconnects firstdeck portion (738) and second deck portion (740) on a respective side ofcentral longitudinal axis (LA). Accordingly, it will be appreciated thateach of first deck portion (738), second deck portion (740), first side(780) of third deck portion (742), and second side (782) of third deckportion (742) extends along a respective, successive angular range ofdeck surface (730) about central longitudinal axis (LA). Each side (780,782) of third deck portion (742) is formed with a greater transversewidth, in a plane defined by deck surface (730) and in a directionperpendicular to the imaginary deck surface centerline, than either offirst deck portion (738) and second deck portion (740) in order toeffectively accommodate staple openings (760) that are orientatedangularly relative to the imaginary deck surface centerline, asdescribed in greater detail below.

Each side (780, 782) of third deck portion (742) includes a respectiveiteration of second array (748) of staple openings (760) having a thirdinner row (776) and a third outer row (778). Second array of stapleopenings are collectively arranged in a simplified herringbone patternin which adjacent staple openings (760) define a V-shape. Third innerrow (776) lies along an inner imaginary line (IIL) spaced a firstdistance from the longitudinal axis (LA) and third outer row (778) liesalong an outer imaginary line (OIL) spaced a second distance from thelongitudinal axis (LA). Second distance is greater than first distance.Each staple opening (760) of third inner row (776) is oriented in afirst angular, non-tangential orientation relative to inner imaginaryline (IIC), and each staple opening (760) of third outer row (778) isoriented in an opposite second angular, non-tangential orientationrelative to outer imaginary line (OIC). In the present example, stapleopenings (760) of third inner and outer rows (776, 778) areperpendicular to one another. A first end (772) of each staple opening(760) in third inner row (776) is closer to the longitudinal axis (LA)relative to a second end (774) of each staple opening (760) in thirdinner row (776). A first end (772) of each staple openings (760) inthird outer row (778) is farther from the longitudinal axis (LA)relative to the second end (774) of each staple opening (760) in thirdouter row (778).

It will be appreciated that any of the exemplary stapling headassemblies described herein, such as stapling head assemblies (720,820), may be further configured in accordance with any one or more ofthe teachings of U.S. Pat. App. No. [Atty. Ref. END9347USNP3], entitled“Non-Circular End Effector Features for Circular Surgical Stapler,”filed on even date herewith, the disclosure of which is incorporated byreference herein.

C. Exemplary Stapling Head Assembly With Alternating Arrays of StapleForming Features and Spacing For Anvil Coupling Feature

In some instances, it may be desirable to modify stapling head assembly(720) to incorporate features that provide greater clearance for anactuatable trocar or other anvil coupling feature that is translatablealong central longitudinal axis (LA).

FIG. 13 shows an exemplary alternative stapling head assembly (820) thatis constructed and operable similar to stapling head assembly (720)described above, except as otherwise described below. Stapling headassembly (820), like stapling head assembly (720), includes a bodymember (822) and a deck member (824) having a deck surface (830) with afirst deck portion (738), a second portion (740), and a third deckportion (842) that interconnects first deck portion (738) and seconddeck portion (740). Though not shown, it will be understood that deckmember (824) may be angularly stepped similar to deck member (724)described above. Specifically, first deck portion (738) may define afirst deck plane that orthogonally intersects central longitudinal axis(LA); second deck portion (740) may define a second deck plane that alsoorthogonally intersects central longitudinal axis (LA) and thus isparallel with but distal to the first deck plane; and third deck portion(842) may define a third deck plane that is obliquely angled relative tocentral longitudinal axis (LA) and each of the first and second deckplanes. In other versions, deck portions (738, 740, 842) may be coplanarsuch that deck surface (830) defines a single deck plane that eitherorthogonally or obliquely intersects central longitudinal axis (LA).

Third deck portion (842) of deck member (824) differs from third deckportion (742) of deck member (724) in that third deck portion (842)includes a pair of central portions (844) diametrically opposed aboutthe central longitudinal axis (LA) and each having a radially outwardlyextending recess feature positioned along inner perimeter (834) of deckmember (824). As a result, inner perimeter (834) of deck surface (830)steps away from the central longitudinal axis (LA) at each centralportion (844) resulting in central portion (844) having a narrowertransverse width than other portions of third deck portion (842). In thepresent version, each central portion (844) deviates from third deckportion (842) with a linear portion of inner perimeter (834) thatextends transverse and away from longitudinal axis (LA) and returns tothird deck portion (842) with another linear portion that extends at anopposite angle transversely and toward the longitudinal axis (LA). Thisconfiguration of central portions (844) provides additional clearancefor proximal and distal translation of trocar (816) within lumen (832).In some versions, inner perimeter (834) at central portions (844) mayhave a round, oval, square, triangular shape, or any additional shapeknown in the art to provide additional clearance between moving andnon-moving members. As shown, knife member (818) is formed with asimilar dog bone shape that complements the dog bone shape of interiorperimeter (834), for example as disclosed in greater detail in U.S. Pat.App. No. [Atty. Ref. END9347USNP3], incorporated by reference above.

Each of first deck portion (738) and second deck portion (740) of deckmember (824) includes a respective iteration of a first array (810) ofstaple openings (760) that is similar to first array (746), describedabove. Each side of third deck portion (842) includes three distinctzones, where staple openings (760) are arranged differently in eachzone. A first zone extends between first deck portion (738) and thecorresponding central portion (844); a second zone extends betweensecond deck portion (740) and central portion (844); and a third zoneextends through central portion (844). Staple openings (760) of thefirst zone are oriented angularly and non-tangentially relative to theimaginary deck surface centerline in a first simplified herringbonepattern, similar to staple openings (760) in third deck portion (742) ofstapling head assembly (720). Staple openings (760) of the second zoneare oriented angularly and non-tangentially relative to the imaginarydeck surface centerline in a second simplified herringbone pattern (812)that mirrors the first simplified herringbone pattern about an imaginaryline that extends through the central longitudinal axis (LA) and bisectseach of the central portions (844). Staple openings (760) of the thirdzone are oriented in a third pattern (814) in which each staple opening(760) extends parallel to the imaginary deck surface centerline.

In each central portion (844) of third deck portion (842), third array(814) of staple openings (760) includes an inner row (884) and an outerrow (886). In the present version, Inner row (884) includes a singlestaple opening (760) that is aligned with central longitudinal axis(LA). In other versions, inner row (884) may include multiple stapleopenings (760) that span across the linear distance of the centralportion (844). Outer row (886) includes two staple openings (760) thatdefine a staple gap (766) between them that is aligned with the singlestaple opening (760) of inner row (884). It will be appreciated that thestaple pattern portions applied to tissue structures (20, 40) by thefirst and second zones of third deck portion (842) as described aboveexhibit a greater ability to radially expand and contract than thestaple pattern portions applied by the third zone and by first andsecond deck portions (738, 740).

FIG. 14 schematically shows stapling head assemblies (720, 820) having adeck surface (730, 830) that is stepped. As described above, decksurface (730, 830) includes first deck portion (738) orthogonal to thecentral longitudinal axis (LA), second deck portion (740) orthogonal tothe central longitudinal axis (LA) and parallel to the first deckportion (738), and third deck portion (742, 842) that is obliquelyangled relative to the central longitudinal axis (LA) and each of thefirst and second deck portions (738, 740).

D. Exemplary Stapling Head Assembly With Obliquely Angled Deck SurfacePortions

FIG. 15 schematically shows another exemplary stapling head assembly(920) that is constructed and operable similar to stapling headassemblies (720, 820) described above, except as otherwise describedbelow. Stapling head assembly (920) includes a deck surface (930) havinga first deck portion (938) obliquely angled relative to the centrallongitudinal axis (LA), a second deck portion (940) obliquely angledrelative to the longitudinal axis (LA), and a third deck portion (942)obliquely angled relative to the central longitudinal axis (LA). In thepresent version, third deck portion (942) is more steeply angledrelative to central longitudinal axis (LA) than each of first and seconddeck portions (938, 940), which themselves be oriented at the sameoblique angle or different oblique angles relative to centrallongitudinal axis (LA). It will be appreciated that any suitable angulararrangement of deck portions (938, 940, 942) may be provided in otherversions.

E. Exemplary Stapling Head Assembly With Elliptical Deck Member

In some instances, it may be desirable to maintain a circular shapedinterior perimeter and a corresponding inner diameter of deck member(320), and a circular shaped exterior perimeter and a correspondingouter diameter of stapling head assembly (300). In some such instances,it may also be desirable to incorporate one or more arrays of stapleopenings that are obliquely angled relative to an imaginary deck surfacecenterline of deck member (320) to thereby enable the resulting staplepattern applied to tissue structures (20. 40) to expand and contractradially with the tissue structures (20, 40) at anastomosis (70), forexample during peristalsis. FIGS. 16-17 show an exemplary stapling headassembly (1000) having such features and configured for use surgicalinstrument (10) in place of stapling head assembly (300). It will beappreciated that stapling head assembly (1000) is similar to staplinghead assembly (300) except as otherwise described.

Stapling head assembly (1000) includes a body member (1002) operativelyattached to the distal end of shaft assembly (200) (see FIG. 1 ) andhaving a circular exterior surface (1006). In other versions, bodymember (1002) may have an oval exterior surface (not shown). Staplinghead assembly (1000) further includes an elliptical deck member (1004)having a distally facing surface in the form of an elliptical decksurface (1030).

Elliptical deck surface (1030) defines a deck plane (DP) that isobliquely angled relative to the central longitudinal axis (LA), andincludes an interior perimeter (1034) and an exterior perimeter (1036).Interior perimeter (1034) is circular and defines a circular lumen(1032) that extends proximally within the deck member (1004). Exteriorperimeter (1036) has an oval shape within deck plane (DP). Ellipticaldeck surface (1030) includes a first (1010) of staple openings (1060)and a second array (1020) of staple openings (1060) extending throughdeck surface (1030).

First array (1010) of staple openings (1060) has a first section (1012)and a third section (1014). First section (1012) is located in a firstquadrant (I) of the deck surface (1030) and third section (1014) islocated in a third quadrant (III) of deck surface (1030) that isdiametrically opposed relative to first quadrant (I). Second array(1020) of staple openings (1060) has a second section (1022) and afourth section (1024). Second section (1022) is located in a secondquadrant (II) of the deck surface (1030) and fourth section (1024) islocated in a fourth quadrant (IV) of deck surface (1030) that isdiametrically opposed relative to second quadrant (II). Second andfourth quadrant (II, IV) are located in a wider portion of deck surface(1030) configured to accommodate the second array (1020) of stapleopenings (1060) that have a herringbone pattern configured to enableradial expansion and contraction of the corresponding portions ofstapled tissue. As described in greater detail below, each stapleopening (1060) of first array (1010) located in first and third sections(1012, 1014) extends tangentially to an imaginary deck surfacecenterline. In contrast, each staple opening (1060) of second array(1020) located in second and fourth sections (1022, 1024) extendsobliquely angularly and non-tangentially relative to the imaginary decksurface centerline, defining a herringbone pattern. Accordingly, thestaple pattern portions applied to tissue structures (20, 40) by secondand fourth sections (1022, 1024) are configured to have a greater degreeof radial expandability and contractability than the staple patternportions applied to tissue structures (20, 40) by first and thirdsections (1012, 1014).

Staple openings (1060) of first and second arrays (1010, 1020) are sizedand configured similarly to staple openings (558) or (560) of staplinghead assembly (500) (see FIGS. 8-9 ). Staple openings (1060) in thefirst array (1010) may be longer than staple openings (1060) of secondarray (1020) or may be sized the same as staple openings (660) (see FIG.10 ). In the present version, staple openings (1060) of both arrays(1010, 1020) are similarly sized.

First array (1010) of staple openings (1060) includes a first inner row(1038) and a first outer row (1040). Both first and second sections(1012, 1014) have first inner and first outer rows (1038, 1040). Firstinner row (1038) lies along an inner imaginary circle (IIC). Innerimaginary circle (IIC) is centered around the longitudinal axis (LA).First inner row (1038) is positioned within the first outer row (1040)that lies along an outer imaginary ellipse (OIE). Staple openings (1060)in first inner row (1038) are circumferentially indexed relative tostaple openings (1060) in first outer row (1040) and vise-versa so thatstaple openings (1060) in first outer row (1038) overlap a gap (1048)between staples openings (558) of the first inner row (540).

Second array (1020) of staple openings (1060) includes a second innerrow (1042), a second middle row (1044), and a second outer row (1046).Second inner row (1042) is positioned along inner imaginary circle (IIC)and is angularly oriented relative to inner imaginary circle (IIC).Second outer row (1044) is positioned along outer imaginary ellipse(OIE) and is angularly orientated relative to outer imaginary ellipse(OIE). Second middle row (1046) is positioned along inner imaginaryellipse (IIE). Inner imaginary ellipse (IIE) is positioned within outerimaginary ellipse (IIE) and inner imaginary circle (IIC) isconcentrically positioned within inner imaginary ellipse (IIE).

Staple openings (560) of second inner row (1042) are non-tangentiallyangularly oriented relative to inner imaginary circle (IIC) with a firstend (1072) that is spaced closer longitudinal axis than the second end(1074). Staple openings (1060) of second outer row (1046) are angularlyoriented relative to the outer imaginary ellipse (OIE) oriented at thesame angle relative to staple openings (1060) in second inner row (542).In the present version, staple openings (560) in second inner and secondouter rows (542, 546) are angled with an offset angle of 45 degreesrelative to the respective inner imaginary circle (IIC) and outerimaginary ellipse (IIC, OIE).

Staple openings (1060) of second middle row (1044) are angularlyoriented in an opposite direction relative to staple openings (1060) insecond inner and outer rows (1042, 1046) resulting in the first ends(1072) of each of staple openings (1060) in second middle row (1044)being farther from longitudinal axis (LA) than second ends (1074).Staple openings (560) of the second middle row (574) are offset at anangle of 40 degrees relative to the inner imaginary ellipse (IIE).

III. Exemplary Combinations

The following examples relate to various non-exhaustive ways in whichthe teachings herein may be combined or applied. The following examplesare not intended to restrict the coverage of any claims that may bepresented at any time in this application or in subsequent filings ofthis application. No disclaimer is intended. The following examples arebeing provided for nothing more than merely illustrative purposes. It iscontemplated that the various teachings herein may be arranged andapplied in numerous other ways. It is also contemplated that somevariations may omit certain features referred to in the below examples.Therefore, none of the aspects or features referred to below should bedeemed critical unless otherwise explicitly indicated as such at a laterdate by the inventors or by a successor in interest to the inventors. Ifany claims are presented in this application or in subsequent filingsrelated to this application that include additional features beyondthose referred to below, those additional features shall not be presumedto have been added for any reason relating to patentability.

Example 1

A surgical instrument comprising: (a) a stapling assembly including: (i)a body extending distally along a longitudinal axis, (ii) a deck memberdisposed at a distal end of the body and defining a deck surface havingan imaginary deck surface centerline that surrounds the longitudinalaxis, wherein the deck surface includes: (A) a first deck surfaceportion extending along a first angular range of the deck surface aboutthe longitudinal axis, (B) a second deck surface portion extending alonga second angular range of the deck surface about the longitudinal axis,(C) a first array of staple openings disposed on the first deck surfaceportion and arranged in a first orientation relative to the deck surfacecenterline, and (D) a second array of staple openings disposed on thesecond deck surface portion and arranged in a second orientationrelative to the deck surface centerline, wherein the second orientationis different than the first orientation, and (iii) a knife memberdisposed within the body and surrounding the longitudinal axis; and (b)an anvil configured to releasably couple with the stapling assembly tocompress tissue against the deck member and form staples in the tissue.

Example 2

The surgical instrument of Example 1, wherein each staple opening of thefirst array of staple openings is sized differently than each stapleopening of the second array of staple openings.

Example 3

The surgical instrument of any of the preceding Examples, wherein thefirst deck surface portion and the second deck surface portion arecircumferentially adjacent.

Example 4

The surgical instrument of any of the preceding Examples, wherein thedeck member includes an arcuate portion and a linear portion.

Example 5

The surgical instrument of any of the preceding Examples, wherein eachstaple opening of the first array of staple openings is orientedtangentially or parallel relative to the deck surface centerline.

Example 6

The surgical instrument of any of the preceding Examples, wherein eachstaple opening of the second array of staple openings is arranged in anon-tangential angled orientation relative to the deck surfacecenterline.

Example 7

The surgical instrument of any of the preceding Examples, wherein thesecond array of staple openings includes a first row of staple openingshaving a first angular orientation relative to the deck surfacecenterline and a second row of staple openings having a second angularorientation relative to the deck surface centerline, wherein the firstangular orientation is different than the second angular orientation.

Example 8

The surgical instrument of any of the preceding Examples, wherein thesecond array of staple openings comprises a herringbone pattern.

Example 9

The surgical instrument of any of the preceding Examples, wherein thedeck surface defines a deck plane that is obliquely angled relative tothe longitudinal axis.

Example 10

The surgical instrument of any of the preceding Examples, wherein thedeck surface further includes: (A) a third deck surface portionextending along a third angular range of the deck surface and beingopposed from the first deck surface portion about the longitudinal axis,(B) a fourth deck surface portion extending along a fourth angular rangeof the deck surface and being opposed from the second deck surfaceportion about the longitudinal axis, (C) a third array of stapleopenings disposed on the third deck surface portion and arranged in thefirst orientation relative to the deck surface centerline, and (D) afourth array of staple openings disposed on the fourth deck surfaceportion and arranged in the second orientation relative to the decksurface centerline.

Example 11

The surgical instrument of Example 10, wherein the first orientationcomprises a tangential or parallel orientation relative to the decksurface centerline, wherein the second orientation comprises anobliquely angled orientation relative to the deck surface centerline.

Example 12

The surgical instrument of any of the preceding Examples, wherein thedeck member includes an outer perimeter having an elliptical shape andan inner perimeter having a circular shape.

Example 13

The surgical instrument of any of the preceding Examples, wherein thefirst deck surface portion defines a first deck plane and the seconddeck surface portion defines a second deck plane that is angled relativeto the first deck plane.

Example 14

The surgical instrument of Example 13, wherein the first deck surfaceportion has an arcuate shape in the first deck plane and the second decksurface portion has a linear shape in the second deck plane.

Example 15

The surgical instrument of any of Examples 13 through 14, wherein thefirst deck plane is orthogonal to the longitudinal axis, wherein thesecond plane is obliquely angled relative to the longitudinal axis.

Example 16

A surgical instrument comprising: (a) a stapling assembly including: (i)a body extending along a longitudinal axis, (ii) a deck member disposedat a distal end of the body and defining a deck surface having animaginary deck surface centerline that surrounds the longitudinal axis,wherein the deck surface includes: (A) a first array of staple openingsdisposed on a first deck surface portion, wherein each of the stapleopenings of the first array is oriented tangentially or parallelrelative to the deck surface centerline, and (B) a second array ofstaple openings disposed on a second deck surface portioncircumferentially adjacent to the first deck surface portion, whereineach of the staple openings of the second array is oriented angularlyand non-tangentially relative to the deck surface centerline, and (iii)a knife member disposed within the body and surrounding the longitudinalaxis; and (c) an anvil configured to releasably couple with the staplingassembly to compress tissue against the deck member and form staples inthe tissue.

Example 17

The surgical instrument of Example 16, wherein the first deck surfaceportion defines a first deck plane and the second deck surface portiondefines a second deck plane that is angled relative to the first deckplane.

Example 18

The surgical instrument of any of Examples 16 through 17, wherein thesecond array of staple openings includes a first row of staple openingsand a second row of staple openings arranged outwardly of the first row,wherein each staple opening of the first row is angled in a firstangular orientation relative to the deck surface centerline, whereineach staple opening of the second row is angled in a second angularorientation relative to the deck surface centerline, wherein the secondangular orientation is different than the first angular orientation.

Example 19

A surgical instrument comprising: (a) a stapling assembly including: (i)a body extending along a longitudinal axis, (ii) a deck member disposedat a distal end of the body and defining a deck surface having animaginary deck surface centerline that surrounds the longitudinal axis,wherein the deck surface includes: (A) a first array of staple openingsdisposed on a first deck surface portion that extends along a firstangular range of the deck surface about the longitudinal axis, (B) asecond array of staple openings disposed on a second deck surfaceportion that extends along a second angular range of the deck surfaceabout the longitudinal axis, (C) a third array of staple openingsdisposed on a third deck surface portion that extends along a thirdangular range of the deck surface about the longitudinal axis, and (D) afourth array of staple openings disposed on a fourth deck surfaceportion that extends along a fourth angular range of the deck surfaceabout the longitudinal axis, wherein the first deck surface portion andthe third deck surface portion are opposed about the longitudinal axis,wherein the second deck surface portion and the fourth deck surfaceportion are opposed about the longitudinal axis, wherein the stapleopenings of the first array and the third array are arranged in a firstorientation relative to the deck surface centerline, wherein the stapleopenings of the second array and the fourth array are arranged in asecond orientation relative to the deck surface centerline, wherein thesecond orientation is different than the first orientation, and (iii) aknife member disposed within the body and surrounding the longitudinalaxis; and (c) an anvil configured to releasably couple with the staplingassembly to compress tissue against the deck member and form staples inthe tissue.

Example 20

The surgical instrument of Example 19, wherein each of the stapleopenings of the first array and the third array is oriented tangentiallyor parallel relative to the deck surface centerline, wherein each of thestaple openings of the second array and the fourth array is orientedangularly and non-tangentially relative to the deck surface centerline.

IV. Miscellaneous

It should also be understood that any one or more of the teachings,expressions, embodiments, examples, etc. described herein may becombined with any one or more of the other teachings, expressions,embodiments, examples, etc. that are described herein. Theabove-described teachings, expressions, embodiments, examples, etc.should therefore not be viewed in isolation relative to each other.Various suitable ways in which the teachings herein may be combined willbe readily apparent to those of ordinary skill in the art in view of theteachings herein. Such modifications and variations are intended to beincluded within the scope of the claims.

Additionally, any one or more of the teachings herein may be combinedwith any one or more of the teachings of U.S. Pat. App. No. [Atty. Ref.END9347USNP1], entitled “Methods of Forming an Anastomosis BetweenOrgans with an Expandable Staple Pattern,” filed on even date herewith;U.S. Pat. App. No. [Atty. Ref. END9347USNP3], entitled “Non-Circular EndEffector Features for Circular Surgical Stapler,” filed on even dateherewith; U.S. Pat. App. No. [Atty. Ref. END9347USNP4], entitled“Circular Surgical Stapler End Effector Having Staple Line AlignmentFeature,” filed on even date herewith; U.S. Pat. App. No. [Atty. Ref.END9347USNP5], entitled “Circular Surgical Stapler for Forming Patternof Non-Tangential Staples,” filed on even date herewith; U.S. Pat. App.No. [Atty. Ref. END9347USNP6], entitled “Circular Surgical StaplerHaving Staples with Expandable Crowns,” filed on even date herewith; andU.S. Pat. App. No. [Atty. Ref. END9347USNP7], entitled “CircularSurgical Stapler for Forming Cross-Pattern of Staples,” filed on evendate herewith. The disclosure of each of these US patent documents isincorporated by reference herein.

It should be appreciated that any patent, publication, or otherdisclosure material, in whole or in part, that is said to beincorporated by reference herein is incorporated herein only to theextent that the incorporated material does not conflict with existingdefinitions, statements, or other disclosure material set forth in thisdisclosure. As such, and to the extent necessary, the disclosure asexplicitly set forth herein supersedes any conflicting materialincorporated herein by reference. Any material, or portion thereof, thatis said to be incorporated by reference herein, but which conflicts withexisting definitions, statements, or other disclosure material set forthherein will only be incorporated to the extent that no conflict arisesbetween that incorporated material and the existing disclosure material.

Versions of the devices described above may have application inconventional medical treatments and procedures conducted by a medicalprofessional, as well as application in robotic-assisted medicaltreatments and procedures. By way of example only, various teachingsherein may be readily incorporated into a robotic surgical system suchas the DAVINCI™ system by Intuitive Surgical, Inc., of Sunnyvale,California.

Versions described above may be designed to be disposed of after asingle use, or they can be designed to be used multiple times. Versionsmay, in either or both cases, be reconditioned for reuse after at leastone use. Reconditioning may include any combination of the steps ofdisassembly of the device, followed by cleaning or replacement ofparticular pieces, and subsequent reassembly. In particular, someversions of the device may be disassembled, and any number of theparticular pieces or parts of the device may be selectively replaced orremoved in any combination. Upon cleaning and/or replacement ofparticular parts, some versions of the device may be reassembled forsubsequent use either at a reconditioning facility, or by a userimmediately prior to a procedure. Those skilled in the art willappreciate that reconditioning of a device may utilize a variety oftechniques for disassembly, cleaning/replacement, and reassembly. Use ofsuch techniques, and the resulting reconditioned device, are all withinthe scope of the present application.

By way of example only, versions described herein may be sterilizedbefore and/or after a procedure. In one sterilization technique, thedevice is placed in a closed and sealed container, such as a plastic orTYVEK bag. The container and device may then be placed in a field ofradiation that can penetrate the container, such as gamma radiation,x-rays, or high-energy electrons. The radiation may kill bacteria on thedevice and in the container. The sterilized device may then be stored inthe sterile container for later use. A device may also be sterilizedusing any other technique the art, including but not limited to beta orgamma radiation, ethylene oxide, or steam.

Having shown and described various embodiments of the present invention,further adaptations of the methods and systems described herein may beaccomplished by appropriate modifications by one of ordinary skill inthe art without departing from the scope of the present invention.Several of such potential modifications have been mentioned, and otherswill be apparent to those skilled in the art. For instance, theexamples, embodiments, geometrics, materials, dimensions, ratios, steps,and the like discussed above are illustrative and are not required.Accordingly, the scope of the present invention should be considered interms of the following claims and is understood not to be limited to thedetails of structure and operation shown and described in thespecification and drawings.

I/We claim:
 1. A surgical instrument comprising: (a) a stapling assemblyincluding: (i) a body extending distally along a longitudinal axis, (ii)a deck member disposed at a distal end of the body and defining a decksurface having an imaginary deck surface centerline that surrounds thelongitudinal axis, wherein the deck surface includes: (A) a first decksurface portion extending along a first angular range of the decksurface about the longitudinal axis, (B) a second deck surface portionextending along a second angular range of the deck surface about thelongitudinal axis, (C) a first array of staple openings disposed on thefirst deck surface portion and arranged in a first orientation relativeto the deck surface centerline, and (D) a second array of stapleopenings disposed on the second deck surface portion and arranged in asecond orientation relative to the deck surface centerline, wherein thesecond orientation is different than the first orientation, and (iii) aknife member disposed within the body and surrounding the longitudinalaxis; and (b) an anvil configured to releasably couple with the staplingassembly to compress tissue against the deck member and form staples inthe tissue.
 2. The surgical instrument of claim 1, wherein each stapleopening of the first array of staple openings is sized differently thaneach staple opening of the second array of staple openings.
 3. Thesurgical instrument of claim 1, wherein the first deck surface portionand the second deck surface portion are circumferentially adjacent. 4.The surgical instrument of claim 1, wherein the deck member includes anarcuate portion and a linear portion.
 5. The surgical instrument ofclaim 1, wherein each staple opening of the first array of stapleopenings is oriented tangentially or parallel relative to the decksurface centerline.
 6. The surgical instrument of claim 1, wherein eachstaple opening of the second array of staple openings is arranged in anon-tangential angled orientation relative to the deck surfacecenterline.
 7. The surgical instrument of claim 6, wherein the secondarray of staple openings includes a first row of staple openings havinga first angular orientation relative to the deck surface centerline anda second row of staple openings having a second angular orientationrelative to the deck surface centerline, wherein the first angularorientation is different than the second angular orientation.
 8. Thesurgical instrument of claim 7, wherein the second array of stapleopenings comprises a herringbone pattern.
 9. The surgical instrument ofclaim 1, wherein the deck surface defines a deck plane that is obliquelyangled relative to the longitudinal axis.
 10. The surgical instrument ofclaim 1, wherein the deck surface further includes: (A) a third decksurface portion extending along a third angular range of the decksurface and being opposed from the first deck surface portion about thelongitudinal axis, (B) a fourth deck surface portion extending along afourth angular range of the deck surface and being opposed from thesecond deck surface portion about the longitudinal axis, (C) a thirdarray of staple openings disposed on the third deck surface portion andarranged in the first orientation relative to the deck surfacecenterline, and (D) a fourth array of staple openings disposed on thefourth deck surface portion and arranged in the second orientationrelative to the deck surface centerline.
 11. The surgical instrument ofclaim 10, wherein the first orientation comprises a tangential orparallel orientation relative to the deck surface centerline, whereinthe second orientation comprises an obliquely angled orientationrelative to the deck surface centerline.
 12. The surgical instrument ofclaim 1, wherein the deck member includes an outer perimeter having anelliptical shape and an inner perimeter having a circular shape.
 13. Thesurgical instrument of claim 1, wherein the first deck surface portiondefines a first deck plane and the second deck surface portion defines asecond deck plane that is angled relative to the first deck plane. 14.The surgical instrument of claim 13, wherein the first deck surfaceportion has an arcuate shape in the first deck plane and the second decksurface portion has a linear shape in the second deck plane.
 15. Thesurgical instrument of claim 13, wherein the first deck plane isorthogonal to the longitudinal axis, wherein the second plane isobliquely angled relative to the longitudinal axis.
 16. A surgicalinstrument comprising: (a) a stapling assembly including: (i) a bodyextending along a longitudinal axis, (ii) a deck member disposed at adistal end of the body and defining a deck surface having an imaginarydeck surface centerline that surrounds the longitudinal axis, whereinthe deck surface includes: (A) a first array of staple openings disposedon a first deck surface portion, wherein each of the staple openings ofthe first array is oriented tangentially or parallel relative to thedeck surface centerline, and (B) a second array of staple openingsdisposed on a second deck surface portion circumferentially adjacent tothe first deck surface portion, wherein each of the staple openings ofthe second array is oriented angularly and non-tangentially relative tothe deck surface centerline, and (iii) a knife member disposed withinthe body and surrounding the longitudinal axis; and (c) an anvilconfigured to releasably couple with the stapling assembly to compresstissue against the deck member and form staples in the tissue.
 17. Thesurgical instrument of claim 16, wherein the first deck surface portiondefines a first deck plane and the second deck surface portion defines asecond deck plane that is angled relative to the first deck plane. 18.The surgical instrument of claim 16, wherein the second array of stapleopenings includes an first row of staple openings and second row ofstaple openings arranged outwardly of the first row, wherein each stapleopening of the first row is angled in a first angular orientationrelative to the deck surface centerline, wherein each staple opening ofthe second row is angled in a second angular orientation relative to thedeck surface centerline, wherein the second angular orientation isdifferent than the first angular orientation.
 19. A surgical instrumentcomprising: (a) a stapling assembly including: (i) a body extendingalong a longitudinal axis, (ii) a deck member disposed at a distal endof the body and defining a deck surface having an imaginary deck surfacecenterline that surrounds the longitudinal axis, wherein the decksurface includes: (A) a first array of staple openings disposed on afirst deck surface portion that extends along a first angular range ofthe deck surface about the longitudinal axis, (B) a second array ofstaple openings disposed on a second deck surface portion that extendsalong a second angular range of the deck surface about the longitudinalaxis, (C) a third array of staple openings disposed on a third decksurface portion that extends along a third angular range of the decksurface about the longitudinal axis, and (D) a fourth array of stapleopenings disposed on a fourth deck surface portion that extends along afourth angular range of the deck surface about the longitudinal axis,wherein the first deck surface portion and the third deck surfaceportion are opposed about the longitudinal axis, wherein the second decksurface portion and the fourth deck surface portion are opposed aboutthe longitudinal axis, wherein the staple openings of the first arrayand the third array are arranged in a first orientation relative to thedeck surface centerline, wherein the staple openings of the second arrayand the fourth array are arranged in a second orientation relative tothe deck surface centerline, wherein the second orientation is differentthan the first orientation, and (iii) a knife member disposed within thebody and surrounding the longitudinal axis; and (c) an anvil configuredto releasably couple with the stapling assembly to compress tissueagainst the deck member and form staples in the tissue.
 20. The surgicalinstrument of claim 19, wherein each of the staple openings of the firstarray and the third array is oriented tangentially or parallel relativeto the deck surface centerline, wherein each of the staple openings ofthe second array and the fourth array is oriented angularly andnon-tangentially relative to the deck surface centerline.